So I've been experiencing something that has been making my head spin. I've had guests cross out the seat(s) reserved number and add their own. The thing is, we weren't able to give every single person a plus one. We have a huge family and most of our friends and family have spouses or long term partners. When we had spaces left after doing the guest list, we were able to give a few plus ones, but not everyone. Today I got a text from my half sister saying shes sending out her rsvp late and shes bringing 2 extra people......wahhh??? Who does that?? I only gave her one space..... For the most part, I've been telling people that due to space limitations, we are able to add more people to the list, but if spaces open up, we'll be glad to accommodate. I know that not everyone is up on their wedding etiquette, but isn't this just common sense? Has anyone experienced this? How do you deal?